PND pipes differ in three characteristics: the simplest and most understandable — diameter. The second characteristic (SDR) indicates the degree of stability of the pipe to pressure from the inside. It is defined as the ratio of the diameter of the pipe of the external to the magnitude that determines the thickness of its walls. Accordingly, the thicker the wall, the lower the indicator and the higher the strength of the pipe. The third indicator is a pipe brand that determines its purpose. For example, a pipe that has a PE80 marking is used for water supply and sewage of private houses, cottages and other cases where it will be small enough — up to 9 cm — sections. Pip PE100 are used to organize large water supply systems, main water supply.
